Bevel question: it is possible to bevel in different directions?
..Expanding on @francois gibon's answer..


in Vertex Mode on the corner-vertex, AltD duplicate it, dragging slightly in the direction of interest, and right-clicking to cancel the move. (Don't deselect)
GG slide the duplicate vertex along the edge to the point you want the bevel to stop. 
Repeat for the other direction(s)
CtrlShiftB bevel the corner with 'Width Type: Percent', to 100%. If the bevel tool is already set up from previous use, that's just dragging the bevel as far as it will go.
With all vertices selected, AltM merge > 'By
Distance', to tidy away the duplicates.